<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket客户端</title>
</head>
<body>

<script type="text/javascript">
    var socket;
    if(window.WebSocket){
        socket = new WebSocket("ws://localhost:8899/ws")

        socket.onmessage =function (ev) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value + "\n" + ev.data;
        }

        socket.onopen = function (ev) {
            var ta  = document.getElementById("responseText");
            ta.value = "连接开启";
        }

        socket.onclose = function (ev) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value +"\n"+"连接关闭";
        }



    }else{
        alert("浏览器不支持websocket");
    }


    function send( message) {
        if(!window.WebSocket){
            return;
        }
        if(socket.readyState == WebSocket.OPEN){
            socket.send(message);
        }else {
            alert("连接尚未开启!");
        }

    }

</script>

<form onsubmit="return false;">
    <h3>客户端输入：</h3>
    <textarea name = "message" style="width: 400px; heigth: 200px"></textarea>
    <input type="button" value="发送数据" onclick="send(this.form.message.value)">
    <h3>服务端输出：</h3>

    <textarea id="responseText" style="width:400px; height: 300px"></textarea>
    <input type="button" onclick="javascript:document.getElementById('responseText').value=''" value="清空内容">

</form>

</body>
</html>